Vaporizer



G. R. WELCH VAPORIZER Filed Feb. 25, 1924 I ATTORNEY.

Patented Dec. 1 8,- 1928.

UNITED STATES PATENT OFFICE.

enoner: a. WELGH, or nn'raorr, MICHIGAN, ASSIGNOR, BY, MEsNE ASSIGNMENTS, 'ro HANDY GovEa oR CORBORATION,1OF na'raorr, MICHIGAN, A CORPORATION or MICHIGAN.

VAPORIZER.

-. Application filed February 25, 1924. Serial No 694,995.

The object of this invention is to automatically compensate for the variation in temperature of the exhaust gases. The great problem in a vaporizer of the type described is that if a sufficient area is provided for low speedoperation the areaat high speed is altogether too big and vice versa. The invention is shown applied to a four cylinder engine. I 3

Figure 1 shows a cross sectional elevation ofa combined. inlet and exhaust manifold showing vaporizing means'for the mixture.

Figure 2 is a cross sectional elevation on the plane 2-% of Figure 1.

. Figure 3 is a horizontal cross sectional elevation on the plane 3-3 of Figure 1.

A. is the mixture entrance which admits the explosive mixture to the'inl-et manifold. Theinlet manifold consists of two branches B and C, which communicate with two inlet ports D and E. The-inlet ports Dand E are also connected by'the dependent pas sage This dependent passage K is cast integral with the exhaust manifold G, being cored therein, as shown in Fi re 1.

The inlet manifoldis provided with four I exhaust ports F F F F and the exhaust out V the Jet H. The dependent passage K is so located as to be swept by the exhaust from each of the four exhaust ports. The passage K is preferably of substantially the .same area as than 40% of the passage B in order that it can function as desired. In Figures 2 and 3 the lips J J are shown surrounding the in- Iet ports D and E.

Operation; Assuming that the mixture is being drawn in through the inlet port D, an explosive mixture enters at A, and a portion flows through directly into D. Anotherportion is from K to D. The portion flowing through- B is relatively cold, and wet fuel will be deposited on the walls of the inlet manifold at this point. This fuel willbe prevented by the lips from entering the mixture entrances D.

' G, flows down t e dependent passage K, bev

' Whenthe inlet valve: connected to the let port E opens, the wet fuel which was prevented by the li s J from entering the port ing drawn down by the air drawn from K into the port E. The wet fuel which is drawn down into K is thus ra idly vaporized.

- It thus follows that the mixture drawn in passage B, and it should'not be smaller I at E will consist of a mixture of finely atomcles of fuelw'hich arebeing vaporized in K, together with highly heated air. At high engine speed, when the pulsations due to the inlet valves opening are frequent, the heating value of the dependent passage K will be reduced and therefore the heating effect of the vaporizer will be lessened automatically without any valves or car of any kind. On the other hand, when t e engine is runized fuel and cold air, and the coarser pa-rtining slowly the inlet-valve opens intermittently and'suificient time'elapses between successive openings for the fuel to be carried into K and to be thoroughly vaporized therein. What I claim is:

1'. -A vaporizer for a multicylinder internal combustion engine having external carbureting means, comprising a mixture entrance, an

inlet manifold in the form of a loopfcomprising an upper portion with which said mixture-entrance communicates, a substantially horizontal lower portion into which liquid, fuel is adapted to drain by gravity and in which the fuel mixture will oscillate,

an exhaust. manifold in a heat relation with the lower port-ion of said manifold for vapor izing the fuel therein, a plurality of mixture combination of av manifoldhaving an intake heavy particles of fuel oil that are dropped from the mixture passing through the intake portion, said trap communica'tmg with the said intake portion immediately at the entrance into the cylinders'and only a oppoutilize the heat of the exhaust. substantially'its entire length. y

3. A manifold, comprising a s'inglecasting forming above an intakemanifold, provided with discharge ends for deliverin a mixture into the cylinder block, and be ow an exhaust manifold havin a plurality of exhaust inlets for communicating with the gasesalong sitei ends of the trap, said trap arranged to engine block, said casting provided with a cored out passage having only its ends communicating with the two dischar e'ends of theintake manifoldportion and aving the main portion closed offfrom the intake manifold and lying along the main portion of the exhaust passage whereby the heavy particles of mixture passing through the intake manifold are caught and collected in the said trap where they are vaporized by the heat of the gases.

4. A manifold, comprising a casting forming an intake manifold provided with discharge ends for delivering a mixture into the cylinder block, and baflle means located in said discharge ends immediately at the entrances .into the cylinder and a closed trap member communicating with said discharge ends on the side of the bafile means remote from the cylinder block, and a main exhaust conduit in which said trap is located directly in the line of the exhaust from the ing ports for connection with the cylinderblock. and an upper manifold having clownwardly extending portions ending in ports for connection with the cylinder block, the said exhaust manifold having an additional closed passage cored in its upper side, and opening only into the intake manifold below the cylinder ports. n

In testimony whereof I affix my signature.

GEORGE R. lVELCl-l. 

